package com.dome.mp.server.utils.sign;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import java.nio.charset.StandardCharsets;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;


/**
 * describe:
 *
 * @author: TanXin
 * @date: 2020/3/27 13:56
 */
public final class RSA {
    private RSA() {
    }
//    private static Map<Integer, String> keyMap = new HashMap<Integer, String>();  //用于封装随机产生的公钥与私钥
//    public static void main(String[] args) throws Exception {
//        //生成公钥和私钥
//        genKeyPair();
//        //加密字符串
//        String message = "这是个中午字符串@asdFGB#";
//        System.out.println("随机生成的公钥为:" + keyMap.get(0));
//        System.out.println("随机生成的私钥为:" + keyMap.get(1));
//        String messageEn = encrypt(message,keyMap.get(0));
//        System.out.println(message + "\t加密后的字符串为:" + messageEn);
//        String messageDe = decrypt(messageEn,keyMap.get(1));
//        System.out.println("还原后的字符串为:" + messageDe);
//    }

    // 算法/模式/填充
    private static final String INSTANCE = "RSA";
    /**
     * 随机生成密钥对
     * @throws NoSuchAlgorithmException
     */
//    public static void genKeyPair() throws NoSuchAlgorithmException {
//        // KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
//        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(INSTANCE);
//        // 初始化密钥对生成器，密钥大小为96-1024位
//        keyPairGen.initialize(1024,new SecureRandom());
//        // 生成一个密钥对，保存在keyPair中
//        KeyPair keyPair = keyPairGen.generateKeyPair();
//        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();   // 得到私钥
//        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();  // 得到公钥
//        String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));
//        // 得到私钥字符串
//        String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));
//        // 将公钥和私钥保存到Map
//        keyMap.put(0,publicKeyString);  //0表示公钥
//        keyMap.put(1,privateKeyString);  //1表示私钥
//    }

    /**
     * RSA公钥加密
     *
     * @param str       加密字符串
     * @param publicKey 公钥
     * @return 密文
     * @throws Exception 加密过程中的异常信息
     */
    public static String encrypt(String str, String publicKey) throws Exception {
        //base64编码的公钥
        byte[] decoded = Base64.decodeBase64(publicKey);
        RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance(INSTANCE).generatePublic(new X509EncodedKeySpec(decoded));
        //RSA加密
        Cipher cipher = Cipher.getInstance(INSTANCE);
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes(StandardCharsets.UTF_8)));
        return outStr;
    }

    /**
     * RSA私钥解密
     *
     * @param str        加密字符串
     * @param privateKey 私钥
     * @return 铭文
     * @throws Exception 解密过程中的异常信息
     */
    public static String decrypt(String str, String privateKey) throws Exception {
        //64位解码加密后的字符串
        byte[] inputByte = Base64.decodeBase64(str.getBytes(StandardCharsets.UTF_8));
        //base64编码的私钥
        byte[] decoded = Base64.decodeBase64(privateKey);
        RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance(INSTANCE).generatePrivate(new PKCS8EncodedKeySpec(decoded));
        //RSA解密
        Cipher cipher = Cipher.getInstance(INSTANCE);
        cipher.init(Cipher.DECRYPT_MODE, priKey);
        String outStr = new String(cipher.doFinal(inputByte));
        return outStr;
    }

}
